Upgrade Quarkus version to 2.6
As with !213 (merged), we recreated a Quarkus project and carefully inspected what changed. This is mainly the Dockerfiles.
mvn io.quarkus.platform:quarkus-maven-plugin:2.6.3.Final:create \
-DprojectGroupId=theodolite \
-DprojectArtifactId=theodolite \
-DclassName="org.acme.rest.GreetingResource" \
-Dpath="/theodolite" \
-Dextensions="kotlin,kubernetes-client" \
-DbuildTool=gradle
Might fix #328 (closed).